Physics Question #1896

Rehan Ahmed, a 17 year old male from Rahim yar Khan, Pakistan asks on February 12, 2004,

What is vacuum ? How is it created because if we remove the air then the instrument in which we are making the vaccum it will break or contract? How could i create vacuum at home?

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The answer

Barry Shell answered on February 12, 2004

A vacuum is simply the absence of anything, including air or any gas. To make one, you generally just pump the air out of a vessel. You are right that the vessel could collapse from atmospheric pressure, so for this reason, high vacuum vessels are made of strong materials and are often sphere shaped for strength. Atmospheric pressure is not that huge, so it's possible to do this even with glass. There is a lot of information about creating vacuums for the home hobbyist. Start at The Bell Jar.

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